DeepSkyBagger Posted April 14, 2018 Share Posted April 14, 2018 https://www.ebay.co.uk/itm/A-LARGE-1960-VINTAGE-CHARLES-FRANK-ASTRONOMICAL-TELESCOPE-WITH-EQUATORIAL-STAND/173175325993?hash=item28520dc529:g:rNQAAOSwXqVaj-pQ Can you spot what puzzles me? Link to comment Share on other sites More sharing options...
Uranium235 Posted April 14, 2018 Share Posted April 14, 2018 Two focusers?! rrrright ooook. Whats going on there? Link to comment Share on other sites More sharing options...
DeepSkyBagger Posted April 14, 2018 Author Share Posted April 14, 2018 Is it an early attempt at binocular focusing? (joke) Link to comment Share on other sites More sharing options...
paul mc c Posted April 14, 2018 Share Posted April 14, 2018 Scope is on wrong way round..... Link to comment Share on other sites More sharing options...
Hallingskies Posted April 14, 2018 Share Posted April 14, 2018 Two focussers? Built-in bino? Link to comment Share on other sites More sharing options...
Peter Drew Posted April 14, 2018 Share Posted April 14, 2018 I've built similar reflectors. On mine at least, two interchangeable secondaries were provided, one for visual and one for photography in the days when only SLR's were available. The two focusers took up the difference between the secondary positions. Link to comment Share on other sites More sharing options...
Uranium235 Posted April 14, 2018 Share Posted April 14, 2018 Mystery solved! Link to comment Share on other sites More sharing options...
DeepSkyBagger Posted April 15, 2018 Author Share Posted April 15, 2018 'Ow bizarre! Link to comment Share on other sites More sharing options...
Astrobits Posted April 15, 2018 Share Posted April 15, 2018 In one of the pics there is something on the opposite side of the scope to the second focusser. Could this be a finder arrangement? Nigel Link to comment Share on other sites More sharing options...
Cornelius Varley Posted April 15, 2018 Share Posted April 15, 2018 1 hour ago, Astrobits said: In one of the pics there is something on the opposite side of the scope to the second focusser. Could this be a finder arrangement? Nigel Possibly. Link to comment Share on other sites More sharing options...
Uplooker Posted April 15, 2018 Share Posted April 15, 2018 15 hours ago, DeepSkyBagger said: https://www.ebay.co.uk/itm/A-LARGE-1960-VINTAGE-CHARLES-FRANK-ASTRONOMICAL-TELESCOPE-WITH-EQUATORIAL-STAND/173175325993?hash=item28520dc529:g:rNQAAOSwXqVaj-pQ Can you spot what puzzles me? Take Peter’s reply as the correct answer but I would also like to know why it looks to be housed in a museum? Link to comment Share on other sites More sharing options...
DeepSkyBagger Posted April 15, 2018 Author Share Posted April 15, 2018 1 hour ago, Astrobits said: In one of the pics there is something on the opposite side of the scope to the second focusser. Could this be a finder arrangement? Nigel Ah! I hadn't spotted that. Looks possibly like another diagonal mirror holder. Maybe this is a weird finder setup! Well spotted. Link to comment Share on other sites More sharing options...
DeepSkyBagger Posted April 15, 2018 Author Share Posted April 15, 2018 6 hours ago, Uplooker said: Take Peter’s reply as the correct answer but I would also like to know why it looks to be housed in a museum? In her listing, the seller shouts the following - HAVING A DOWN SIZE AND SELLING LOTS OF ANTIQUE / RETRO AND COLLECTIBLE ITEMS. I assume the 'scope is in her antique / retro and collectible room. Link to comment Share on other sites More sharing options...
F15Rules Posted April 15, 2018 Share Posted April 15, 2018 Is it me (quite possibly as I don't normally look through funnels, sorry, reflectors), but one focuser looks wider than the other? 2" and 1.25" ?? Dave Link to comment Share on other sites More sharing options...
DeepSkyBagger Posted April 15, 2018 Author Share Posted April 15, 2018 11 minutes ago, F15Rules said: Is it me (quite possibly as I don't normally look through funnels, sorry, reflectors), but one focuser looks wider than the other? 2" and 1.25" ?? Dave I doubt that. It's a 1960 scope. I don't know when the standard eyepiece sizes became 'standard', but I suspect it was after that. In any event, the secondary mirror would have to be moveable, and I can't see any indication that it is. Then there's the issue of focal length... Reflectors are funnels? Yes, they funnel vast amounts of light to an eyepiece. Refractors are pencils. They don't. Link to comment Share on other sites More sharing options...
Astrobits Posted April 15, 2018 Share Posted April 15, 2018 As the seller is "Jessica's Antiques" in Huddersfield perhaps someone who is in the vicinity could have a look at it in the shop. I am too far away unfortunately. Nigel Link to comment Share on other sites More sharing options...
Uplooker Posted April 15, 2018 Share Posted April 15, 2018 35 minutes ago, Astrobits said: As the seller is "Jessica's Antiques" in Huddersfield perhaps someone who is in the vicinity could have a look at it in the shop. I am too far away unfortunately. Nigel Well spotted. I had seen it was in Huddersfield but not many of the other details as I was using my phone when I first looked. Link to comment Share on other sites More sharing options...
lenscap Posted April 15, 2018 Share Posted April 15, 2018 I think the smaller of the "focussers" is a reflex finder. A bit like an SLR camera. It looks like it has several concentric tubes - like a "pirate" scope. When you pull the tubes outward a second diagonal mirror is extended into the main tube so the finder, (which is a small frac not just an eyepiece), can see the sky. Tasco refractors used to have something similar. Link to comment Share on other sites More sharing options...
Peter Drew Posted April 15, 2018 Share Posted April 15, 2018 On closer inspection, I agree. Link to comment Share on other sites More sharing options...
Sunshine Posted April 16, 2018 Share Posted April 16, 2018 That one fell off the ugly tree, and hit every branch on the way down. Link to comment Share on other sites More sharing options...
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